| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [verb] to | 25696 |
|
| 2 | could [verb] [prep] | 9783 |
|
| 3 | could [verb] [prep] | 9783 |
|
| 4 | could [verb] to | 2050 |
|
